oracle行转列与列转行的几种方式汇总，

和通数据库htsjk.Com2023-07-20 03:48 来源:未知阅读:786 评论 329 热度4

标签：oracle 行转列列转行

oracle行转列与列转行的几种方式汇总，

1、准备数据：REST表

-- 创建表REST
CREATE TABLE REST (
  "ID" NUMBER,
  "AMOUNT" NUMBER(19,0),
  "MONTH" VARCHAR2(255 BYTE)
);
--执行添加数据语句
INSERT INTO "CERPAWCSADM"."REST" VALUES ('1', '100', 'Jan');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('1', '100', 'Feb');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('1', '66', 'Mar');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('1', '77', 'Jun');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('1', '88', 'Dec');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('1', '12', 'Aug');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('2', '22', 'Feb');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('2', '33', 'Apr');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('2', '232', 'Jul');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('2', '43', 'Sep');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('2', '544', 'Oct');
INSERT INTO "CERPAWCSADM"."REST" VALUES ('2', '65', 'Nov');

2、查询数据

3、行转列

方式1：使用 case when then方式

case 条件

when 值1 then 返回值1

when 值2 then 返回值2

..........

else 默认值

end

-- 使用case when 方式
SELECT
	id,
	sum( CASE month WHEN 'Jan' THEN amount ELSE 0 END ) AS Jan_amount,
	sum( CASE month WHEN 'Feb' THEN amount ELSE 0 END ) AS Feb_amount,
	sum( CASE month WHEN 'Mar' THEN amount ELSE 0 END ) AS Mar_amount,
	sum( CASE month WHEN 'Apr' THEN amount ELSE 0 END ) AS Apr_amount,
	sum( CASE month WHEN 'May' THEN amount ELSE 0 END ) AS May_amount,
	sum( CASE month WHEN 'Jun' THEN amount ELSE 0 END ) AS Jun_amount,
	sum( CASE month WHEN 'Jul' THEN amount ELSE 0 END ) AS Jul_amount,
	sum( CASE month WHEN 'Aug' THEN amount ELSE 0 END ) AS Aug_amount,
	sum( CASE month WHEN 'Sep' THEN amount ELSE 0 END ) AS Sep_amount,
	sum( CASE month WHEN 'Oct' THEN amount ELSE 0 END ) AS Oct_amount,
	sum( CASE month WHEN 'Nov' THEN amount ELSE 0 END ) AS Nov_amount,
	sum( CASE month WHEN 'Dec' THEN amount ELSE 0 END ) AS Dec_amount 
FROM
	REST 
GROUP BY
	id

case when 另一种方式：

        case when 条件 = 值1 then 返回值1

        case when 条件 = 值1 then 返回值1

        else 默认值

        end

SELECT
	id,
	sum( CASE  WHEN month ='Jan' THEN amount ELSE 0 END ) AS Jan_amount,
	sum( CASE  WHEN month = 'Feb' THEN amount ELSE 0 END ) AS Feb_amount,
	sum( CASE  WHEN month = 'Mar' THEN amount ELSE 0 END ) AS Mar_amount,
	sum( CASE  WHEN month = 'Apr' THEN amount ELSE 0 END ) AS Apr_amount,
	sum( CASE  WHEN month = 'May' THEN amount ELSE 0 END ) AS May_amount,
	sum( CASE  WHEN month = 'Jun' THEN amount ELSE 0 END ) AS Jun_amount,
	sum( CASE  WHEN month = 'Jul' THEN amount ELSE 0 END ) AS Jul_amount,
	sum( CASE  WHEN month = 'Aug' THEN amount ELSE 0 END ) AS Aug_amount,
	sum( CASE  WHEN month = 'Sep' THEN amount ELSE 0 END ) AS Sep_amount,
	sum( CASE  WHEN month = 'Oct' THEN amount ELSE 0 END ) AS Oct_amount,
	sum( CASE  WHEN month = 'Nov' THEN amount ELSE 0 END ) AS Nov_amount,
	sum( CASE  WHEN month = 'Dec' THEN amount ELSE 0 END ) AS Dec_amount 
FROM
	REST 
GROUP BY
	id

结果为：

方式2：使用 decode函数

decode函数： DECODE(条件, 值1, 返回值1, 值2,返回值2, 值3,返回值3, . . . else 缺省值)

含义：if 条件 = 值1 then 返回值1 elsif 条件 = 值2 then 返回值2 else (缺省值) endif

--	使用decode函数
SELECT
	id,
	sum( decode( month, 'Jan', amount, 0 ) ) Jan_amount,
	sum( decode( month, 'Feb', amount, 0 ) ) Feb_amount,
	sum( decode( month, 'Mar', amount, 0 ) ) Mar_amount,
	sum( decode( month, 'Apr', amount, 0 ) ) Apr_amount,
	sum( decode( month, 'May', amount, 0 ) ) May_amount,
	sum( decode( month, 'Jun', amount, 0 ) ) Jun_amount,
	sum( decode( month, 'Jul', amount, 0 ) ) Jul_amount,
	sum( decode( month, 'Aug', amount, 0 ) ) Aug_amount,
	sum( decode( month, 'Sep', amount, 0 ) ) Sep_amount,
	sum( decode( month, 'Oct', amount, 0 ) ) Oct_amount,
	sum( decode( month, 'Nov', amount, 0 ) ) Nov_amount,
	sum( decode( month, 'Dec', amount, 0 ) ) Dec_amount 
FROM
	REST 
GROUP BY
	id

结果和方式1一样

方式3：使用pivot函数

pivot
(
<聚合函数>(要聚合的列)
for <要转换的列> in (要转换的列值 as 要转换成的列名)
)

SELECT
	* 
FROM
	 REST pivot (
		SUM(amount) FOR month IN (
			'Jan' AS Jan_amount,
			'Feb' AS Feb_amount,
			'Mar' AS Mar_amount,
			'Apr' AS Apr_amount,
			'May' AS May_amount,
			'Jun' AS Jun_amount,
			'Jul' AS Jul_amount,
			'Aug' AS Aug_amount,
			'Sep' AS Sep_amount,
			'Oct' AS Oct_amount,
			'Nov' AS Nov_amount,
			'Dec' AS Dec_amount 
		) 
	);

结果为：这个结果会发现，如果数据为空没有赋值为0

下面这个方法解决null 转为0 问题

SELECT
	NVl(Jan_amount,0) Jan_amount,
	NVl(Feb_amount,0) Feb_amount,
	NVl(Mar_amount,0) Mar_amount,
	NVl(Apr_amount,0) Apr_amount,
	NVl(May_amount,0) May_amount,
	NVl(Jun_amount,0) Jun_amount,
	NVl(Jul_amount,0) Jul_amount,
	NVl(Aug_amount,0) Aug_amount,
	NVl(Sep_amount,0) Sep_amount,
	NVl(Oct_amount,0) Oct_amount,
	NVl(Nov_amount,0) Nov_amount,
	NVl(Dec_amount,0) Dec_amount
FROM
	 REST pivot (
		SUM(amount) FOR month IN (
			'Jan' AS Jan_amount,
			'Feb' AS Feb_amount,
			'Mar' AS Mar_amount,
			'Apr' AS Apr_amount,
			'May' AS May_amount,
			'Jun' AS Jun_amount,
			'Jul' AS Jul_amount,
			'Aug' AS Aug_amount,
			'Sep' AS Sep_amount,
			'Oct' AS Oct_amount,
			'Nov' AS Nov_amount,
			'Dec' AS Dec_amount 
		) 
	);

结果和方式1一样：

4、列转行

在上述pivot 方法的原sql语句上再加上unpivot函数，将列再转为行，在unpivot函数中，amount：表示由列转换为行后的数据

month：表示由列转换为行后的列名

select * from REST
pivot (sum(amount) for month in (
			'Jan' AS Jan_amount,
			'Feb' AS Feb_amount,
			'Mar' AS Mar_amount,
			'Apr' AS Apr_amount,
			'May' AS May_amount,
			'Jun' AS Jun_amount,
			'Jul' AS Jul_amount,
			'Aug' AS Aug_amount,
			'Sep' AS Sep_amount,
			'Oct' AS Oct_amount,
			'Nov' AS Nov_amount,
			'Dec' AS Dec_amount 
))
unpivot ( amount for month in(Jan_amount,Feb_amount,Mar_amount,Apr_amount,May_amount,Jun_amount,Jul_amount,Aug_amount,Sep_amount,Oct_amount,Nov_amount,Dec_amount));

结果为：

5、直接使用unpivot函数 --列转行

准备数据：TEST表

CREATE TABLE TEST (
  "ID" NUMBER(12,0) NOT NULL,
  "JAN" VARCHAR2(255 BYTE),
  "FEB" VARCHAR2(255 BYTE),
  "MAR" VARCHAR2(255 BYTE),
  "APR" VARCHAR2(255 BYTE),
  "MAY" VARCHAR2(255 BYTE),
  "JUN" VARCHAR2(255 BYTE),
  "JUL" VARCHAR2(255 BYTE),
  "AUG" VARCHAR2(255 BYTE),
  "SEP" VARCHAR2(255 BYTE),
  "OCT" VARCHAR2(255 BYTE),
  "NOV" VARCHAR2(255 BYTE),
  "DEC" VARCHAR2(255 BYTE)
);
-- 插入数据
INSERT INTO "CERPAWCSADM"."TEST" VALUES ('1', '33', '2', '3', '4', '5', '6', '7', '8', '9', '99', '8', '6');
INSERT INTO "CERPAWCSADM"."TEST" VALUES ('2', '22', '3', '4', '6', '5', '7', '0', '7', '22', '21', '343', '76');
INSERT INTO "CERPAWCSADM"."TEST" VALUES ('3', '88', '3', '4', '5', '7', '9', '7', '2', '2', '231', '56', '78');

查询出的数据

列转行sql

SELECT
	* 
FROM TEST
	unpivot ( amount for month in(JAN,FEB,MAR,APR,MAY,JUN,JUL,AUG,SEP,OCT,NOV,DEC));

结果为：

总结

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oracle行转列与列转行的几种方式汇总，

目录

1、准备数据：REST表

2、查询数据

3、行转列

方式1：使用 case when then方式

方式2： 使用 decode函数

方式3：使用pivot函数

4、列转行

5、直接使用unpivot函数 --列转行

总结

方式2：使用 decode函数